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## LTE Tutorial-Page11

This tutorial section on LTE basics covers following sub topics:
Main page  features  terminologies  Frame  TDD FDD  Channel types  PHY  stack  throughput  VoLTE  CA   cell search  network entry  Timers  PSS vs SSS  Security   LTE Bands  EARFCN  Hotspot  router

This tutorial on LTE covers following topics and this page covers lte throughput calculation.

### LTE Throughput calculation

Let us understand peak data rate or LTE throughput calculation with following LTE system configuration.

20MHz channel, 4x4 MIMO configuration,
Theoretically, Peak Data rate= No. of REs per subframe x no. of bits per modulation symbol
=16800 x 6
=100800 bits/ 1 ms
Data Rate=100.8Mbps
For 4x4 MIMO data rate=403Mbps

About 25% of overhead is used here for RS(reference signal), synchronization signals, PDCCH, PBCH & for some coding. This leads to effective data rate of about 403Mbps X 0.75 = 302Mbps.
Each of the Resource Element(RE) will carry a modulation symbol.

Another way for LTE throughput calculation is to use Table number 7.1.7.1-1 which gives Transport Block Size(TBS). TBS indicates No. of bits that can be transmitted in one subframe per Transmit Time Interval. From the table with RBs of 100 and TBS index of 26, Transport Block Size is 75376. For MIMO configuration of 4x4, we will get about data rate(peak) about 75376 x 4 per 1ms. This leads to effective peak data rate of 301.5 Mbps.

Table number 7.1.7.1-1: Modulation and TBS index for PDSCH, REFER: 3GPP TX 36.213
Table number 7.1.7.2.1-1: Transport block size ,REFER: 3GPP TX 36.213

### LTE Throughput Calculator

Refer LTE throughput Calculator which does calculation of LTE throughput based on MCS, Number of PRBs (Physical Resource Blocks) and number of MIMO antennas. Refer LTE throughput calculator>>.